Ring Current Pressure Profiles During Geomagnetic Storms as Observed by TWINS

Details Ring Current Pressure Profiles During Geomagnetic Storms as Observed by TWINS Ring Current Pressure Profiles During Geomagnetic Storms as Observed by TWINS

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2077g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2077

Physics

[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2778] Magnetospheric Physics / Ring Current

Scientific paper

Pressure profiles in the Earth's magnetospheric ring current are an important dynamic geospace diagnostic during geomagnetic storms. The stereo energetic neutral atom (ENA) images provided by the TWINS dual-spacecraft mission offer a unique view of the spatial and temporal variations of the trapped ring current ions during these storms. We present ion pressure distributions deconvolved from stereo ENA images obtained during a number of geomagnetic storms during the time period 2008-11. These include time intervals when substorms are inferred by dipolarizations measured at geosynchronous orbit during both ICME and CIR driven storms. The equatorial pressure gradients are mapped to the polar cap and their spatial distribution compared to the field aligned current distributions from AMPERE. Both the equatorial pressure gradients and field aligned currents are shown to follow injections inferred by the substorm activity.

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